﻿// Accord Core Library
// The Accord.NET Framework
// http://accord-framework.net
//
// Copyright © César Souza, 2009-2017
// cesarsouza at gmail.com
//
//    This library is free software; you can redistribute it and/or
//    modify it under the terms of the GNU Lesser General Public
//    License as published by the Free Software Foundation; either
//    version 2.1 of the License, or (at your option) any later version.
//
//    This library is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//    Lesser General Public License for more details.
//
//    You should have received a copy of the GNU Lesser General Public
//    License along with this library; if not, write to the Free Software
//    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
//

#if NET35
namespace Accord.Compat
{
    using System;
    using System.Threading;
    using global::System.Collections.Generic;

    internal class ConcurrentStack<T> : IEnumerable<T>
    {
        private Stack<T> stack;

        public ConcurrentStack()
        {
            stack = new Stack<T>();
        }

        public void Push(T item)
        {
            lock (stack)
            {
                stack.Push(item);
            }
        }

        public T[] ToArray()
        {
            lock (stack)
            {
                return stack.ToArray();
            }
        }

        public IEnumerator<T> GetEnumerator()
        {
            lock (stack)
            {
                foreach (T value in stack)
                    yield return value;
            }
        }

        global::System.Collections.IEnumerator global::System.Collections.IEnumerable.GetEnumerator()
        {
            lock (stack)
            {
                foreach (T value in stack)
                    yield return value;
            }
        }
    }
}
#endif